import { fetch } from 'dva';
import { Toast } from 'antd-mobile';
import { stringify } from 'qs';
import auth from './auth'

const codeMessage = {
  200: '服务器成功返回请求的数据。',
  201: '新建或修改数据成功。',
  202: '一个请求已经进入后台排队（异步任务）。',
  204: '删除数据成功。',
  400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
  401: '用户没有权限（令牌、用户名、密码错误）。',
  403: '用户得到授权，但是访问是被禁止的。',
  404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
  406: '请求的格式不可得。',
  410: '请求的资源被永久删除，且不会再得到的。',
  422: '当创建一个对象时，发生一个验证错误。',
  500: '服务器发生错误，请检查服务器。',
  502: '网关错误。',
  503: '服务不可用，服务器暂时过载或维护。',
  504: '网关超时。',
};

const checkStatus = response => {
  if (response.status >= 200 && response.status < 300) {
    return response;
  }
  const errortext = codeMessage[response.status] || response.statusText;
  Toast.offline(`请求错误 ${response.status}: ${response.url},${errortext}`);
  const error = new Error(errortext);
  error.name = response.status;
  error.response = response;
  throw error;
};

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [option] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default async function request(url, params, option) {
  await auth
  const options = {
    expirys: true,
    ...option,
  };

  const defaultOptions = {
    credentials: 'include',
  };
  const newOptions = { ...defaultOptions, ...options };
  if (
    newOptions.method === 'POST' ||
    newOptions.method === 'PUT' ||
    newOptions.method === 'DELETE'
  ) {
    if (!(newOptions.body instanceof FormData)) {
      newOptions.headers = {
        Accept: 'application/json',
        'Content-Type': 'application/json; charset=utf-8',
        ...newOptions.headers,
      };
      newOptions.body = JSON.stringify(params);
    } else {
      // newOptions.body is FormData
      newOptions.headers = {
        Accept: 'application/json',
        ...newOptions.headers,
      };
    }
  } else if (
    !newOptions.method || newOptions.method === 'GET'
  ) {
    url = `${url}?${stringify(params)}`
  }
  return fetch(url, newOptions)
    .then(checkStatus)
    .then(response => {
      // DELETE and 204不会默认返回使用.json会导致出错
      if (newOptions.method === 'DELETE' || response.status === 204) {
        return response.text();
      }
      return Promise.resolve(response.json()).then(data => {
        const { success, message, errorMsg, code, errorCode, content } = data
        if (success) {
          return content
        } else {
          const errorObj = {
            message: message || errorMsg,
            code: code || errorCode,
          };
          // 请求失败在dva全局的onError统一处理，如果需要model单独处理，在call外层包try...catch
          return Promise.reject(errorObj);
        }
      })
    })
    .catch(e => {
      const errorObj = {
        message: e.message || e.errorMsg || `${url}请求错误`,
        code: e.code || e.errorCode || 'Unknow Error',
      };
      return Promise.reject(errorObj);
    });
}